生活饮用水中铬(六价)的允许浓度为()
A.0.01mg/L
B.0.05mg/L
C.0.1mg/L
D.0.15mg/L
E.0.2mg/L
参考答案:B
The Trojan War ______ by Helen and her beauty.
A.causes
B.is caused
C.caused
D.was caused
肾有两窍是指:()
A.前后二阴
B.精窍和溺窍
C.两耳
D.后阴与耳
E.前阴与耳